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A biconvex lens has radii of curvature 20   cm each. If the refractive index of the material of the lens is 1 . 5 , the power of the lens is:

Options

  1. A+ 20   D
  2. B+ 5   D
  3. Cinfinity
  4. D+ 2   D

Correct answer

B. + 5   D

Step-by-step solution

Power of the lens is, P = 1 f = μ - 1 1 R 1 - 1 R 2 ⇒ P = 1 . 5 - 1 1 0 . 2 - 1 - 0 . 2 = 0 . 5 × 10 ⇒ P = + 5   D

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